The most common complication of appendectomy is infection of the surgical wound.
Intra-abdominal abscess (fluid), needing drainage.
Paralytic ileus where the gut stops functioning. This usually happens if the appendix ruptures and causes diffuse inflammation.
Deep Vein Thrombosis is rare complication and required further tests.
Risks for any anesthesia include the following:
Problems with breathing
Reactions to medications